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When the charge is considered as point ?...

When the charge is considered as point ?

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When the linear size of charged bodies are much smaller than the distance separating them, the size may be ignored and the charged bodies are treated as point charges.
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Knowledge Check

  • Consider a region inside which there are various types of charges but the total charge is zero. At points outside the region

    A
    the electric field is necessarily zero.
    B
    the electric field is due to the dipole moment of the charge distribution only.
    C
    the dominant electric field is `prop 1/r^(3)` for large r, where r is the distance from a origin in this region.
    D
    the work done to move a charged particle along a closed path, away from the region, will be zero.

  • When some charge is placed on a good conductor,

    A
    it remains at the same position.
    B
    it goes at the centroid of a conductor.
    C
    it remains at the surface of a good conductor.
    D
    none of above.

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